Click the Exhibit button.
Which two statements are correct about the service provider MPLS network shown in the exhibit? (Choose two.)
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Question 64
Correct Answer: B, C
R3 will perform a label swap operation on the transport MPLS label, as it is a transit router within the MPLS network. Traffic from Network 1 to Network 3 and from Network 1 to Network 4 can share the same label-switched path because these paths can be aggregated into a single LSP to optimize resources within the RSVP signaled MPLS core.
Discussion
antigel8Options: BC
C. because Penultimate-hop popping does occur at R3 but R4. R3 is a transit LSR and performs a swap operation. B. because unidirectional LSP from ingress LSR (R1) and egress LSR (R5) can be used by both network 1 and 2 to reach network 3 and 4. R5 perform IP lookup.
robboxisOptions: AB
Someone please correct me if I'm wrong but I think correct here should be A & B ? R3 will definitely do label POP at this stage not swap - swap action needs to be configured manually and that's not specified in question. I also think B because its a RSVP signalled core and a minimal number of LSPs here would be 2 in which case CE routers can share the LSPs? But please, if I'm wrong correct me so we all know. Thanks.
VicVi
Hello! Correct answers are B and C The pop operation is done on penultimate hop (in this case R4) unless you configure explicit-null (that will indicate that R4 put the label 3). R2 and R3 will do swap operation. Here you will have 2 tunnels to reach all Networks. From R1-to-R5 and from R5-to-R1. So yes, B is correct because you use the same to reach N3 and N4
4eeb1f8Options: BC
R3 is a Transit Router and does not perform Pop label operation. It performs Swap label operation.